They do spin really high, sadly they lack a little bit off the line (even though the RX-7's come with 4.10 gears).
Wind one up a bit though and they take off like a bat out of hell. Performance Parts aren't cheap though, it's why my cousin and I pulled the 13B from his RX-7 and dropped in a Supercharged 318 Small Block. Not before we had some fun with the car one last time :D :burnout:
That day I found out those cars have a "Shift Buzzer" instead of a Shift Light. I was hard in the throttle, banging gears and I hear what sounds like a horn. I grab 4th gear and look around, no cars in sight. "Hey man, did you hear a car horn?" "Oh that? It's a shift buzzer." :D